Gas in scattering media absorption spectroscopy - from basic studies to biomedical applications

• The recently introduced Gas in Scattering Media Absorption Spectroscopy (GASMAS) technique provides novel possibilities for analysis in biophotonics. Free gas in pores or cavities is monitored with narrow-band laser radiation, which can discern the gas absorptive imprints which are typically several orders of magnitude more narrow than the features of the surrounding tissue through which the diffusely scattered light emerges to the detector. Important gases monitored are oxygen and water vapour. Applications include diagnosis of human sinus cavities and surveillance of neonatal children, but also characterization of food-stuffs, food packages and pharmaceutical preparations. Non-biological applications include the study of construction materials such as wood, polystyrene foams and ceramics. For nano-porous materials, information on the pore sizes can be obtained from observed line broadening. Apart from concentration measurements, the GASMAS technique also allows the study of gas transport and diffusion, and pressure and temperature information can also be obtained.

Ämnesord

NATURVETENSKAP  -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)

Nyckelord

Gas absorption

scattering

tissue optics

biophotonics

non-intrusive

diagnostics

Beer-Lambert law

line shape

porosity

nano science

oxygen

water vapour

carbon dioxide

ceramics

pharmaceuticals

wood

fruits

food packaging

food safety

tracability

modified atmosphere

sinusitis

otitis

antibiotics resistance

lung function

neonatal

premature babies

Publikations- och innehållstyp

for (ämneskategori)

ref (ämneskategori)